Nah, people want to wake up in the morning and know they can drive somewhere.
Requiring it is crazy.
28% of trips are under a mile, 52% under three, 64% under five, 79% under ten, 93% under twenty-five, and 98% under 50 miles.
Only 0.8% of the trips are over 100 miles!
In a hypothetical future where every single car participated, you probably wouldn't need to dedicate more than a few % capacity to still make an absolutely massive VPP